Is a pie chart or a histogram better at displaying relative frequencies for a qualitative variable?

I am having trouble determining because both can be used.

Which one is a characteristic of a binomial experiment:

-The experiment consists of k identical trials-The probability of a success on a single trial remains the same from trial to trial?

I think it's the probability of a success on a single trial remains the same from trial to trial, but I am not 100% sure.

A pie chart better at displaying relative frequencies for a qualitative variable.

Characteristic of a binomial experiment is : The probability of a success on a single trial remains the same from trial to trial

Step-by-step explanation

Pie charts are typically used to present the relative frequency of qualitative data.

The characteristics of a binomial experiment are:

• The experiment consists of n identical trials.
• Each trial results in one of the two outcomes, called success and failure.
• The probability of success, denoted p, remains the same from trial to trial.
• The n trials are independent.

Thus from point (3), the correct answer is: the probability of a success on a single trial remains the same from trial to trial